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7．case n．事例；场合；事实；案例；箱子 [归纳] in case 以免，万一 in case of 在……情形时，万一 in any case 无论如何，不管怎样 in no case 绝不 as is often the case 这是常有的事 Leave your key with a neighbor in case you lock yourself out one day. 把钥匙交给一个邻居以免哪天你把自己锁在外面。 8．casual adj.漠不经心的，随意的，偶然的 John was dismissed last week because of his casual attitude towards his job. 上周约瀚因工作态度散漫被解雇了。 9．cause v．导致，引起 n．原因，理由；理想 [拓展] cause and effect 因果关系 cause sb./sth. to do sth. 使某人/某事…… Drunken driving is often the cause of accidents. 醉酒驾车常常是造成事故的罪魁祸首。 10．celebrate v．庆祝 [归纳] celebrate Christmas 庆祝圣诞节 [拓展] celebration n. 庆祝(会) in celebration of 为……举行庆祝活动 Today is her birthday，so we're going to celebrate (it)． 今天是她的生日，所以我们要庆祝一下。 11．chance n．机会；可能性 [归纳] There is a chance that... | 
